Air Spring Kit, Loadlifter 5000, Bags / Brackets / Lines, 5000 lb Capacity, Black Powder Coat Brackets, Rear, GM Fullsize Truck 2011-15, Kit. Established in 1949, Air Lift is a family-owned business from Lansing, Michigan that specializes in vehicle air suspension systems and helper springs for Passenger Cars, Trucks, RVs, SUVs, CUVs, and Vans. The Air Lift product line includes air springs, compressor systems, load support products, and related accessory components. Does not fit cab and chassis applications.